Justin had some erasers. He gave
23 of his erasers to Brandon and bought 4 new erasers. After that, he gave
25 of his remaining erasers to his cousin and bought another 7 new erasers. In the end, Justin had 40 erasers.
- How many erasers did Justin give to his cousin?
- How many erasers did Justin have at first?
(a)
Fraction of his remaining erasers after he gave to his cousin
= 1 -
25=
35 35 of his remaining erasers = 40 - 7 = 33
15 of his remaining erasers = 33 ÷ 3 = 11
25 of his remaining erasers = 2 x 11 = 22
Number of erasers that Justin gave to his cousin = 22
(b)
55 of his remaining erasers = 5 x 11 = 55
Fraction of his total erasers after he gave to Brandon
= 1 -
23=
13 13 of his total erasers = 55 - 4 = 51
33 of his total erasers = 3 x 51 = 153
Number of erasers that Justin had at first = 153
Answer(s): (a) 22; (b) 153